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Thanks Bojan, I started by reinstalling all the FETs I had removed for testing, and then lifted the + leg of the LED. Result: stable. Amp works now. Guess I have to find schematic + component

First, amazing, second……. Can anyone else tell he’s been listening to Churchill! ??? Hans, brother, whatever it is, you’ve got it. Keep being you! I love to see/hear someone in love

Hi Jonas, the red LED works at about 1.8 to 2.2V. So the current from the QMX+ should be around 4 mA when active: (5V-2V)/(220R + 470R). The Q204 is made for the current up to 130mA. So there is quite

I would very carefully check all of the solder joints and components adjacent to the paddle jack, and where ever on the board the connections from the paddle go. This is not normal behavior, so you

Did you check your power supply (see my post #130557 ( /g/QRPLabs/message/130557 ) )? 73 Ludwig

Went on to remove Q5 and Q6 again from amp board. Still only 2.45v on junction or R14 & R15 when TXing. Then I decided to see how much current the QMX+ could deliver on PTT port. The answer is

Hans: I bought you more coffee to keep you going during the coding and testing. Chris

If you are going to use a switched-element tuner you should seriously consider adding an absorptive VSWR bridge between the final amp and the tuner, to limit the VSWR excursions seen by the output

I just loaded FW version 22 and same thing, menus/encoders/button active. After paddle closure, no Tx, no Rx; locked up. Have to pull DC power to shut off. Myron WV0H

WHEW ! -- N4QA/QRP

On Sat, Sep 28, 2024 at 12:13 PM, Hans Summers wrote: > > Hi Chris, Stefan, all > > > If I recall correctly Hans has shelved the QSX > > No, I've never said that. To be sure, literally speaking,

Michael- Sorry for the late reply regarding reusing the 28AWG on the rewind.? I did not.? I actually didn't get enough of the 28 in the kit to finish the radio.? I wonder if the parts bag was for

Hi Ludwig - I went back to look at the terminal menus, searched through all selections and couldn't find where I enabled it.?I did confirm that it does not transmit after you do a Factory Reset (FW

Personally, I think THESE things below are mandatory. But definitely, a 3:1 SWR range on the Antenna Tuner does not get it done. It barely allows much mismatch to be tolerated over the radio without

Pierre:? Such an amplifier exists, although not from QRO Labs, the Hard Rock 50 https://hobbypcb.com/products/hardrock-50-hf-power-amp-kit There is a 100 watt and a 500 watt version as well.? I have

Hans:? Suggestion for improvement. This issue of inadequate enamel removal keeps coming up on an almost-daily basis.? While I am sure that you and your crew have become adept at the enamel-burning

Hans, this is amazing news! I have a K4, and my experience with CESSB parallels your vision… The result is almost like having a linear amplifier — about 2 db virtual improvement for those hearing

Added info - We finished assembling the QMX+. ?When performing the ADC I/Q test we observe no I phase present on all bands(flat line). ?Q phase looks fine. ?Looking at the possible trouble shooting

Peter, had you prevailed, we wouldn’t have learned so much today.

We also removed the trifilar and retested, then reinstalled. Sam